Folding knife



FIG. 1 is a left side elevational view of the design of the present invention for a folding knife, showing the knife in an extended position;

FIG. 2 is a right side elevational view of the knife of FIG. 1;

FIG. 3 is a front elevational view of the knife of FIG. 1;

FIG. 4 is a rear elevational view of the knife of FIG. 1;

FIG. 5 is a top plan view of the knife of FIG. 1;

FIG. 6 is a bottom plan view of the knife of FIG. 1.

FIG. 7 is a left side elevation view, similar to FIG. 1, but with the blade in a folded position; and,

FIG. 8 is a right side elevation view, similar to FIG. 2, but with the blade in a folded position.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a folding knife, as shown and described. 